PHP获取http头信息

获取http请求的头信息。

PHP手册提供了现成的函数：

getallheaders

(PHP 4, PHP 5)

getallheaders — Fetch all HTTP request headers

说明

array getallheaders ( void )

Fetches all HTTP headers from the current request.

This function is an alias for apache_request_headers(). Please read theapache_request_headers() documentation for more information on how this function works.

返回值

An associative array of all the HTTP headers in the current request, orFALSE on failure. 

Example #1 getallheaders() example

<?php

foreach (getallheaders() as $name => $value) {
    echo "$name: $value\n";
}

?> 

不过这个函数只能在apache环境下使用，iis或者nginx并不支持，可以通过自定义函数实现

<?php 
if (!function_exists('getallheaders')) 
{
    function getallheaders() 
    {
       foreach ($_SERVER as $name => $value) 
       {
           if (substr($name, 0, 5) == 'HTTP_') 
           {
               $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
           }
       }
       return $headers;
    }
} 
?> 

好了，看看都打印出了啥吧

<?php
print_r(getallheaders());

获得结果：

Array
(
    [Accept] => */*
    [Accept-Language] => zh-cn
    [Accept-Encoding] => gzip, deflate
    [User-Agent] => Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727)
    [Host] => localhost
    [Connection] => Keep-Alive
)